Electric blasting-cap



Patented May 17. 1921.

l@ d ATTORNEYS.

A. L.v OLIVER. ELECTRIC BLASTNG CAP. APPLICAUQN men MM2?. 1920.

f af me! r/ comme@ new: interina @Li- 37 resiclinff eunliy elf ilfeliniefia einer lieve inrenterl eertezin ,rweinenlvr in Eieetrie ich the feilowing is en ,nh :is er. presprin'ided ing: er arrest,- Vy nthe i@ rianne is prevented "f ziiiaingr elle charge to lier ie princiY `leiler wherein ilfeulzure e; 'lileringg Gzip l n eniisirni'iinn iS pr@ enlxiinenl iiliering ine; ne in eupzilile eilfunc :i fienile or Spark, un@ l enil arranged tu be nu ef :in elec'lsrie current. iai-:wille :i eonsrueion mriis emilte by the "Slm ignier will noi;

'lLlie Xpluuive nlmrge of combustion fr {us-1e powder tir eS ingr-:rfi er pre lie marin explosive oder which,

l :mii one Wliieli inne find whereby ientieneel und einer b- 'ventien Consise in nlie `f i @.,iflrenmbinaiion 0i parts rilieilr illusrrzite in the nc- A une. nel eel; feriali vin the l bein unfierstoorl in lerin, @reperwe ile nfl' construction minimi; niny loe re implication ed. January 27, 1926.

miibing of the Vepeeiully ,lpsirentel serial. 1ro. esmas.

sorted to without departing from tlie spirit er sacrificing any of the advanuges of the invenieii. y

To comprehend ,the invention reference is elireeecl to the/1' IGennip:inyingg-g drawings, wherein, Y

F ign re i, is e veri'eai secional View of the preferred embodiment of my inenien.

F 2 is n transverse seetioi'ni-l view taken on line 2*-2 of Fig. l.

Fig. B is u View of the upper end of :L merlilierl iorin (if construction.

Fig. 4 is'uy transverse sectional 0n line .l--al of Fig.

Referring to the dra-wings wherein like clmrzuters. of reference cleeig :le Corre.- spnnilmg: parla l indicates :i mv fble time fuse el? any ilesirerl material rr'^-\ieled in its center with the open ended be EL which is illeil willi powder 3 forniirh ai suitable powder train. Secured in any ui ble mane ner m the upper enll of the ti. le fuse l, :is by crimping at 1, is. the lower engl of a. metallic shell 5, the upper por'izion of which is preferably enlarged providing n chamber (l for containing an ignitingz; ceinpound or inlunnnulile substance 7. T he chamber 6 is provided with ein upper will 8 which is the lower surface 0i' a Snizrlele plug 9 positioned within the metallic Shell and preferably 0V u. diameter snniller'tliun the interior of the shell te prnville ai space i() eurruunding'the plug, *filiere ille plug` inferior of the fzln-ill is p'ovirleci with 5, limiy 1i, of any euitalvie filtering materials suoli an asbestos or the like`r unil lie Seine held between lle upper surface uit' lie plilgg el uml fi-lie lower surface of a Suitable closure plug; il prefw erziiily (ne Sulfur which is pus-3i Einer-l in the upper end 0f the metallic shell. The plug 11" is preernbiy lielfl, in position by the crimped portions 12, und is provided with the centrally clisposecl vent i3. the lower end ni which is normally closed by i Wzicl or dieplacing member 14, which is held in porsilion by :r ,f g'reneeor wax filling; in the 'upper enfj. of alle bore 13. Elect-rie conducters l exten@` dmvnmmily through the plus; il, filtering materiel il :incl plug 9 inte` lli/e elmnrber wliere the ends thereof passes through the body 7 of igniting compound. In this construction, it will be apparent that the filtering material 11 is selfcontained within a metallic shell and is positioned therein between the vent opening 13 and the chamber 6, whereby the Gases generated on the ignition of the inammable substance 7 must ltering material prior to interior of the shell 5. This construction prevents the use of the device with the filtering material disconnected or removed therefrom which is often the case when the devices for this purpose as now on the mar? ketare used by inexperienced persons, and with often great damage and premature eX- plosion to the blast.

' To the lower end of the fuse 1 islprefer- .ably secured by crimping as at-18, a metallic'cap 19 which contains a suitable fulminat'ing compoundsuch as fulminate of mercury, and the joint connections between the metallic cap 19 and metallic shell 5 andthe fuse l are protected bya suitable waterproof compound or shell 20, which overlies pass through the escaping from the the terminal edges of the respective shell and cap, as illustrated` in Fig. 1.

clearness of vdescription the same operates as follows:

The device being assembled as in the'drawings with either the metallic cap 19 and its associated parts secured to or eliminated from the time 'I'use 1, depending on the type orn blasting powder used, current is supplied to the conductors 16. The current passing through the conductors 16 heats the resistance coil 17 causing an explosion of the igniting or inflammable compound 7, the gases from which due to being confined within the shell 5 expand and sages 410 surrounding the plug 9, pass through the ilteringrmaterial 11 and act on the 'ball 14 forcing the same upwardly into the bore 13 and displacing the grease or Wax filling 15 in said bore 13, thusl providing an opening from the chamber 6 to the exterior of they metallic shell 5, for the gases, but it will be readily understood that the gases in passing from the chamber 6 to the exterior of the shell 5 must pass through the filtering materiaal before, passing through the bore 13. The explosion lof the igniting compound ignitesthe powder train 3, which burns for any given time depending on the length pf t e lower end of the fuse, it ignites the fulminating compound within the metallic cap 19.

Should this cap 19 and vfulmmating compound be dispensed with, th'e powder train \ignites the material associated with the lower end of the fuse 1. l

In the construction illustrated 1n Fig. 3 it perend of the shell to the exterior there The action of the present exploder is simi-` lar to those already on the market, but for pass through the air pas will be observed that a solid plug 21, prefer- -ably of sulfur, is positioned to close the up.- shell 5, and that the shell iml mediately below the lower endof the plug is provided with the vents or openings 22, communicatin with the inner end of the liltering materil which is the shell, as in the construction illustrated in Fig. 1. To firmly close the vents or openings at its upper end is extended ports\or openings 22. In this case, the explosion of he igniting compound causes a breaking awa of the sleevev at its upper end 22 Vcompleting the opening in the ports or channels from hg interior of the It will be'apparent that\ the present construction provides a safe and simple electric fuse igniter which will not emit sparks or ame, as the gases of combustion are filtered prior to passing from the interior of the fuse, and one where it is impossible to use the construction with t'he :filtering material eliminated therefrom, as it is contained and concealed within the fuse structure. y aving thus described my invention what claim is:

1. The` combination with a fuse, a tubular metallic shellA member secured at one end positioned within thereto, aminflammable substance contained within said\ shell for igniting said fuse, a ,plug member for closing one end -of said `shell, one of said members being provided with a normally closed vent for permitting the escape of generated gases from within said shell and adapted for opening on the igniting of said inflammable substance, a lil-v tering material within the shell intermediate theA inflammable substance and said vent opening, and electric means extended into said inflammable substance for igniting the same.

2. The combination with a fuse, a tubular metallic shell positioned over and secured to one 'end thereof, an inammable substance contained within said shell for igniting said fuse, a plug for closing the open end of the shell, a plug held withinv the shellin spaced relation to the Walls thereof and adjacent to said inflammable substance and .with said shell providing a chamber, a liltering medium within saidu chamber between said plugs, electric means extended into said shell for igniting said nllammable substance, and a normally closed vent formed in one wall of said chamber and through which the products of combustion escape from said shell after passing through said filtering material.

3. The combination with a fuse, a tubular shell secured thereto, an. inflammable substance contained within the shell, a plug within the Shen adjacent to Said inflammable 1 inner en s of said conductors and extending into said inammalole material and a body of filtering material Within said shell between 10 said plugs.

In testimony whereof have signed my name to this specification in the presence of a subscribing Witness.

ALBERT LESLIE oui/EE..

Witness:

HARRY A. TOTTEN. 

